Back exercise apparatus



FIG. 1 is a perspective view of a back exercise apparatus, showing ournew design;

FIG. 2 is a rear elevational view of the back exercise apparatus shownin FIG. 1;

FIG. 3 is a right side elevational view of the back exercise apparatusshown in FIG. 1;

FIG. 4 is a front elevational view of the back exercise apparatus shownin FIG. 1;

FIG. 5 is a left side elevational view of the back exercise apparatusshown in FIG. 1;

FIG. 6 is a top plan view of the back exercise apparatus shown in FIG.1; and,

FIG. 7 is a bottom plan view of the back exercise apparatus shown inFIG. 1.

The ornamental design for a back exercise apparatus, as shown anddescribed.